21283001 has 2 divisors, whose sum is σ = 21283002. Its totient is φ = 21283000.

The previous prime is 21282991. The next prime is 21283033. The reversal of 21283001 is 10038212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13987600 + 7295401 = 3740^2 + 2701^2 .

It is a cyclic number.

It is not a de Polignac number, because 21283001 - 2¹⁴ = 21266617 is a prime.

It is a super-2 number, since 2×21283001² = 905932263132002, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (21283091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10641500 + 10641501.

It is an arithmetic number, because the mean of its divisors is an integer number (10641501).

Almost surely, 2^21283001 is an apocalyptic number.

It is an amenable number.

21283001 is a deficient number, since it is larger than the sum of its proper divisors (1).

21283001 is an equidigital number, since it uses as much as digits as its factorization.

21283001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 21283001 is about 4613.3503010285. The cubic root of 21283001 is about 277.1262224123.

The spelling of 21283001 in words is "twenty-one million, two hundred eighty-three thousand, one".